BriComp

Let's start with the first serial port on pins 1&2, this is addressed as Serial1, so Serial1.begin(11520); works. Likewise for the second serial port on pins 7&8, this is addressed as Serial2 and Serial2.begin(11520); works. I am sure you get the...

The SDA lines may need to have pull up resistors added.

Could you explain what you mean by the above sentence. I think I know what you mean, but we have a large number of members who DO NOT have English as a first language and may not understand your sentence, especially the halts the Teensy inviting...

Hi, @duff it's so good to see you back.

I have some in the UK, if you are interested.

This should have the 9bit information you require.

Ditto on Windows 10.

Can't you buy the chips from Mouser then ship them to the PCB factory yourself?

Personally I would use OLED screens such as this. Square ones are available a little cheaper. They are driven by I2C which is slower than SPI, but I suspect that speed is not a priority as they will (I guess) not be changed very frequently...